Fluid handling – Systems – Dividing into parallel flow paths with recombining
Patent
1977-02-02
1978-09-19
Nilson, Robert G.
Fluid handling
Systems
Dividing into parallel flow paths with recombining
49 92, 98110, F24F 1314, F16K 122
Patent
active
041146468
ABSTRACT:
A novel fire, smoke and air control damper is disclosed wherein one or more hook-shaped hinge portions formed intermediate between the longitudinal edges of each damper blade engage complementally configured hook-shaped hinge elements formed on opposite sides of the damper frame. Formed on each of the ends of each damper blade are additional hook-shaped sealing portions which are adapted to mate with the hook-shaped sealing portions of adjacent blades in the closed position in order to form a double seal. A "dead" air chamber is formed between contiguous portions of adjacent blades when those blades are in the closed position. As the blades are slightly displaced towards the open position, a seal is nonetheless maintained between the blades due to the configuration of the sealing portions thereof. As the blades are further displaced, a serpentine air path is formed having a maximum fluid frictional resistance, which resistance is further amplified by the provision of a spoiler disposed adjacent to the tip of each hook-shaped sealing portion of each blade. Finally, the blades are movable to any of a variety of open positions so that volume control is easily effectuated.
In the closed position, various blade portions also engage opposite sides of an inwardly depending flange in said frame to form a seal therebetween, thereby providing a positive pressure resistant seal.
REFERENCES:
patent: 2654921 (1953-10-01), Blanchard
patent: 2759573 (1956-08-01), Schwab
patent: 2996768 (1961-08-01), Brown
patent: 3381601 (1968-05-01), McCabe
patent: 3741102 (1973-06-01), Kaiser
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